dry-python / dry-python/returns

Pylint hangs when running on a module that has type annotations from returns

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Descrição

I've noticed pylint is hanging (vscode's python plugin started to consume 100% CPU) when trying to lint a module that has type annotations from returns library.

Consider the following `test.py`:
```python
from returns.maybe import Maybe, Some

x: Maybe[int] = Some(1)
```
Running `pylint test.py` will hang forever.

Not sure if the problem is with returns or pylint itself (or maybe something with my local setup, tried both with my regular pylint config and without it though). Didn't spend much time debugging it, but sometimes I noticed it hangs in `astroid.decorators.raise_if_nothing_inferred` generator. Does anyone experience the same?

```
python: 3.7.9, 3.9.0
pylint: 2.6.0
astroid: 2.4.2
returns: 0.15.0
```

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Direção de pesquisa

Reproduce the hang with the supplied test.py example and the listed Python, pylint, astroid, and returns versions. Start by tracing the astroid.decorators.raise_if_nothing_inferred generator while running pylint, then inspect the surrounding type-inference path. Done means pylint completes on the example without hanging and a regression test covers it.

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Avaliação

Stack de tecnologia
python
Domínio
tooling
Tipo de issue
Bug
Dificuldade
4/5
Tempo estimado
3-5 dias
Status de atividade
Estagnada
Clareza
Razoavelmente clara
Facilidade para iniciantes
35/100

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